Spring #1 Has Spring Constant 61

Spring #1 has spring constant 61.0 N/m.Spring #2 has an unknown spring constant,but when connected in series with Spring #1,the connected springs have an effective spring constant of 20.0 N/m.What is the spring constant for Spring #2?

A) 41.0 N/m
B) 81.0 N/m
C) 15.1 N/m
D) 29.8 N/m
E) 71.0 N/m

Correct Answer:

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